400W not enough?

I just had a random reset...it just happened as I scrolled down on a page, nothing really PSU intensive. I've had the same thing happen twice before. I have a 400W PSU, but it shouldn't be the problem......Is there anything else that may be causing this? Windows errors? I do get a few BSODs here and there...

And I'm not (currently) overclocking at all.

The thing is, 400W should be plenty for what I'm running! My specs are in my profile...It's not like I have 8 HD's or something like that.

all power supplies are not created equal. some 200 watt PSU's actually outperform some 300 watt PSU's. many cheaply made PSU's deliver less than HALF of their rated power output. on top of that many manufacturers are still not pumping up the 12V rail. modern Processors like athlon XP's and P4's draw power fromthe 12v rail and any power supply that doestn provide at least 16amps on the 12v rail is one I wouldnt buy.

Check the 12V rail for output on your 400W if it is less than 15amps it isnt sufficient. when I built my 2 ghz P$ I tried to use the 300 watt PSU that came with the case it wouldnt even boot the system checking the PSU I found that it only put out 10 amps onthe 12V rail the P$ 2 ghz draws almost 9 amps by itself. I got a 420watt PSU that puts out 18amps on the 12v rail and no more problems.

15A on the 12V rail should be sufficient as long as you dont have more than one hard drive or several case fans. if you have acess to another power supply you might try hooking it up and seec if the problem continues.

since this has happned before while scrolling maybe you should check your mouse and drivers. what kind is it? try another mouse and see if the problem continues

Hey what brand is it Veh? Cause I know the cheapo 400w have extremely poor internal circutry most of the time, and can cause problems after you've had them for awhile(been there too)....

But I have a question about P.S.U. problems myself, recently after upgrading my parents pc form a 700mhz Duron to a 1.2Ghz Duron, It started freezing, just a dead freeze, it seems to be doing this all the time, whenever it wants too, I managed to fix it for awhile by disabling the power saving modes in the bios and in windows, but the problem is worse now, It has a cheap 250w PSU in it, Is that not the problem? Oh and I added a strip of 512mb too....

Originally posted by iss 15A on the 12V rail should be sufficient as long as you dont have more than one hard drive or several case fans. if you have acess to another power supply you might try hooking it up and seec if the problem continues.

since this has happned before while scrolling maybe you should check your mouse and drivers. what kind is it? try another mouse and see if the problem continues

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I have 2 HDD's + 2 CDROM's + 9 total fans...

I have access to a 300W El Cheapo(TM) that wouldn't put me any better off than this one.

My mouse is a Logitech USB Optical Special Edition (M-BJ58), and I just downloaded the latest MouseWare I think a week ago.

I disabled a couple of my onboard features (LAN, sound) from my BIOS, just now, so that should help.

vassil -> Here's my PSU, except I got the silver 400W model, and it was alot more expensive when I bought it...around $70 I think. Mid-range PSU, IMHO. Not El Cheapo but not excellent Well built PSU, IMHO, very quiet, no electric noise, voltage deviation is minimal.

Originally posted by vassil3427 But I have a question about P.S.U. problems myself, recently after upgrading my parents pc form a 700mhz Duron to a 1.2Ghz Duron, It started freezing, just a dead freeze, it seems to be doing this all the time, whenever it wants too, I managed to fix it for awhile by disabling the power saving modes in the bios and in windows, but the problem is worse now, It has a cheap 250w PSU in it, Is that not the problem? Oh and I added a strip of 512mb too....

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That might be it, the RAM, take out the old RAM and just run the new 512 for a while, if the problem continues it could be the RAM. You can verify that by running just the old, if it runs fine 1 of 2 things could be happening:
1. You got a bad 512 module.
or
2. Your old and new RAM don't get along with each other. (could be due to different CAS latencys or speeds, or just general incompatability).

interesting thread i don't know how my computer is still running with all the kit i got inside. (take a look at the profile to see whats inside) the spec on my psu says +3.3v = 28a, +12v =10a, +5v = 30a and it hasn't let me down in a year and runs flat out doing lots of video crunching and when it's not doing that it's running the UD agent 24/7.
I have been running video compression for the last few hours and still is, I just checked the voltages with Sandra and I got board 30c cpu 45c 3.3v = 1.5v 5v = 4.62v 12v = 11.75v stand by = 4.82v.
It's a Chinese century star psu I think they rated it at 350w and it is superbly put togeather. it has a secondy fan in the event of overheating and to the best of my knowledge it has never ran, maybe it's bust
Quality has a part to play along with the numbers.

I don't know many people who run enough stuff to need 400W. I have a 400W but the last time I checked the values, it came out to 309W being used.

The values you guys are reading are what the lines are each rated at, and not meant to be applied all at once. It means that the +12v is capable of 28A but if you maxed out each of them then you'd overload the PSU. While you can max one or more lines, you'd have to take the others down or else it would overload. Those ratings are pretty much meant to apply to what the wire can handle, they don't have too much to do with the rating of the PSU itself. If they wanted to, they could put wire on each line capable of handling the entire rating, but that wouldn't be very good for other reasons.

You might also want to consider that your line voltage may be fluctuating. In the US, the electrical code is very loose on what 120v actually means. it can vary from 105v to 125v at any time, I have even seen some lines that go down to 95v at times. The only cure for this is a good line conditioner. Unless it dips below 95 on a frequent basis, then the power company may fix it.

True, 400W should be sufficient...unless the PSU isnt really delivering the output it says it is and that unfortunately is quite common. if the raidmax isnt delivering the output it claims to deliver or it is having problems then 2 HD's and 9 fans may be more than it can take

well...it might not be your PSU the fact that this happens when you are scrolling is a bit suspicious was this happening BEFORE you installed the new logitech drivers?

you might try unhooking a couple of the fans to see if it is the PSU if you arent overclocking then one fan blowing air in and one blowing out should keep your system cool at least long enough to see if it is the PSU.

BTW you do have good fan grills in place to keep small children from being sucked into your homemade wind tunnel there dont you?